Rotary compressor



Jan. 14, 19360 R, HUFF ROTARY COMPRESSOR 3 Sheets-Sheet 1 Filed Oct. 19, 1953 INVENTOR.

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.Lea ieR HIS ATTORNEY Patented Jano 14, 1936 a PTEQNT OFFICE ROTARY COMPRESSOR Leslie R. Huff, Phillipsburg, N. J., assignor to Ingersoll-Rand Company, Jersey City, N. J., a corporation of New Jersey Application October 19, 1933, Serial No. 694,232

2 Claims.

This invention relates to compressors, and more particularly to rotary compressors employing slidable vanes'for impelling the fluid from the inlet opening to the discharge opening of the compressor.

The objects of the invention are to retain the vanes in substantial sealing relationship with a compression chamber wherein they operate, to minimize the noise incident to the discharge of the compressed fiuid from the compression chamber, and to effect an adequate cooling of the compression chamber and the chambers wherewith it communicates.

Other objects will be in part'obvious and in part pointed out hereinafter.

In the drawings illustrating the invention and in which similar reference numerals refer to similar parts,

Figure 1 is a longitudinal elevation, in section, of a rotary compressor constructed in accordance with tire practice of the invention and taken on the line through Figure 2,

Figure 2 is a transverse view taken on the line 2-2 of Figure 1 looking ,in the direction indicated by the arrows,

Figure 3 is a perspective view of a vane assembly, and I Figure 4 is a view similar to Figure 1 taken through Figure 2 on the line 4-4 looking in the direction indicated by the arrows.

Referring more particularly to the drawings, 20 designates, in general, a blower comprising a casing 2| bored to form a compression chamber 22 of which the ends are closed by heads 23 secured to the casing 2| in any suitable manher, as by bolts 24.

Within the compression chamber 22 is-a rotor 25 which is arranged eccentrically with respect to the compression chamber 22 and has an axial bore 26 into the ends of which are inserted trunnions or shafts 2'! and 28. The shafts 21 and 23 are journaled in anti-friction bearings 29 seated in the heads 23 and may be keyed to the'rotor 25, as by means of pins 30.

Each shaft is provided with an externally threaded portion 3| for the accommodation of a nut acting against the outer end of the bearings 29, and the shaft 21 difiers from the shaft "28 only in that it is provided with an extension 32 whereby it may be coupled to a prime mover (not shown).

The fluid intended to be compressed may be conveyed to the compressor by suitable piping (not shown) but which may open into an inlet chamber 33 having a plurality of branches 34 each one' of which terminates in a port 35 through which the fluid enters the compression chamber 22. In the opposite side of the casing 2| is a. discharge chamber 36 which, like the inlet chamber 33, has oblong branch chambers 31 into which the compressed fluid passes from a port or ports 33 communicating the chambers 31 with the compression chamber 22.

Preferably, a series of ports 38 are arranged in spaced relation with respect to each other 10 and radially with respect to the compression chamber 22. In the present instance three such ports are shown, one each being arranged at the ends of the chambers 31 and one intermediate the ends. Plugs 33 form closures-for certain of the ports 38. The plugs 39 are threaded into the ports 38 and are, therefore, removable to enable the compressed fluid to be discharged less length than the length of the compression chamber 2| and having, at one end, a diagonal surface 43. The edge of greater length of the 30 plates 42 bears against the wall of the compression chamber 22, and in the slots 40 is a complementary plate 44 having a diagonal surface to seat against the diagonal surface 43. Thus when the rotor 25 is in operation the plates 42 35 and 44 are actuated centrifugally outwardly and the plate 44 will, by its :action against, the plate 42, cause the opposite end 46 of the plate 42 to be maintained in sealing relationship with the adjacent surface 41 of the head '23.

In their assembled positions the plates 42 are so arranged that the diagonal surface 43 of one plate lies adjacent the end 46' of the other plate of a pair, thus preventing leakage of fluid over the narrow edges of the plates 44 which are of less height than the plates 42 to prevent contact thereof with the peripheral surface of the chaz ber 22.

One objectionable feature in devices of this character, as heretofore constructed, has been 50 that of the noise incident to the discharge of the compressed fluid through the discharge ports into the discharge chamber. In practice I have found that such noise is due largely to the equal spacing of the vanes 4| and a conse-.

ments in the spaces between the slots located in a quadrant. The spacing of the slots may, however, be otherwise arranged but should be such "that no considerable number of adjacent slots are spaced equal distances apart.

To the end that the surfaces of the vanes and the slots 40, whereby they are guided, may be adequately lubricated a tube 48 leading from an oil container 49 is disposed in an axial bore 50 in the shaft 28 and extends into a similar bore 5| in the shaft 21. The portion of the tube 48 which extends into the shafts is journaled in bushings 52 which may be aflixed to the shaft, as by bracing. In the wall of the tube are ports 53 through which oil passes into passages 54 opening into the bottoms of the slots 40. The ports 53 are so arranged that they will be uncovered by the passages 54 only after completion of compression, thus preventing the entrance of compressed fiuid into the tube to check the flow of oil into the slots 40.

In order to assure rapid dissipation of the heat generated by compression the compressor is provided with a chamber 55 for cooling liquid.

The cooling liquid is introduced into the bottom defined .by arched walls 59 which extend outwardly in the direction of the main chambers 36 and 33. The air in passing through the chambers will thus be brought into contact with large areas of cooling surface to reduce the temperature of both the incoming and discharge fluid.

I claim:

1. In a rotary piston machine the combination with a cylindrical casing having an inlet and an outlet opening, of a rotary piston eccentrically arranged within the-casing, and of loose blades carried by and circumferentially spaced apart on the rotary piston for outward and inward movement, the circumferential distances between adjacent blades being not all equal.

2. In a rotary piston machine as claimed in claim 1, the arrangement that the spacing of the blades varies irregularly and the tips of the blades bear against the casing-inside by centrifugal force.

LESLIE R. HUFF. 

